I am currently doing a deal to trade my Boxster S for a '74 RSR replica racecar built for HSR GT class racing. This car currently has installed a 3.6L MFI engine built by Dave White Racing. The MFI is high butterfly with custom stacks. The pump was rebuilt to a specs using a custom space cam specifically designed for this engines displacement, cams, valve sizes and compression ratio. Jerry Fairchild Industries does all the MFI pump work for Dave White.

This engine dyno'd at 378hp at 7200rpm.

Dave White wants this engine as a spare for the 3.8L MFI engine in his OO HSR racecar. I am trading it to him for a 3.4L that will allow me to run in the classes I wish to run with PCA and NASA. The 3.4L will probably come with PMO's. Dave White usually gets 340-350hp from his 3.4L engines with PMOs. However.... I would much prefer MFI and I may kick in some money on the trade to have the 3.4L with MFI!

So, people can, do and are building larger race engines with custom spec MFI pumps!

I won't quote but a few of the results of people and shops using PMO carbs... but the list is long.

http://www.pmocarb.com/testimonials.htm

I'd say people are getting BIG power using PMO carbs. Read on....

Quote from PMO's website under the testimonials section:



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We recently built two racing engines with your 50mm PMO carbs. The carbs dialed in really quickly and easily. Both engines ran great! The 3.6 put out close to 360 horsepower and the 3.4 close to 340 horsepower. These values are considerably better than what a racing electronic fuel injected engine achieved that we recently dynoed.

Peter, PBR Restorations, Crockett, CA, December 2004
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320 HP out of a 2.8 - most horsepower we’ve seen on a carbureted 2.8 engine on our dyno!

Midwest Eurosport, Bensenville, IL, June 2002

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Fantastic! With 3.0 litre engine ported and polished, GE 80 cams, headers, 10.5 pistons on premium gas - 274 HP at flywheel. Thanks heaps.

Bob Bailey, Victoria, Australia, March 2003

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328 horsepower out of a 2.5 liter! You'd swear it is electronic fuel injection, it's so smooth. We install a lot of EFI systems, but this motor is optimized. I recommend your carburetors to everyone. The customer wouldn't give up those carburetors for anything.

Jarvis Tech, Ft. Lauderdale, FL, September, 2003

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Worked great! The new 50 carbs got 357 horsepower out of a 3.3 on the dyno, with 260 ft/lbs. torque.

Pat Williams Racing, Memphis, TN, October 2003

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Our 3.4 with the 50 PMO's makes 350 HP at the rear wheels! Easily beats out cars with their $20,000 injection systems. At the 2004 PCA race at Road Atlanta we also beat factory 3.8 RSR race cars with our 3.4. With the PMO 46s on our 2 litre cars we get more power and much better drivability than the Weber 46s.

Scott at Auto Associates, Canton, CT, April 2004

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The 2.5 Litre with 50 PMOs put out 308 HP on the dyno. Dave White got the pole and took first in class recently at Daytona with this engine in his car. The engine is now going to Brumos.

Mike Bruns at JB Racing, Tavares, FL, April 2004

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... the list goes on...


TonyG

"can, do and are building larger race engines with custom spec MFI pumps!"

- Good to hear - sounds like there could easily be some cost issues. Next time I decide not ot buy a used Boxster S or 993 and want to use that money to rebuild an engine....